Bicycle frame



FIG. 1 is a right side perspective view of the bicycle frame showing my new design;

FIG. 2 is a right side view of the bicycle frame;

FIG. 3 is a left side view of the bicycle frame;

FIG. 4 is a top view of the bicycle frame;

FIG. 5 is a bottom view of the bicycle frame;

FIG. 6 is a front view of the bicycle frame; and,

FIG. 7 is a back view of the bicycle frame showing my new design. 

The ornamental design for a bicycle frame, as shown. 